Frost Line Depth in Richmond County, NY: 48 in (New York rule)

State-set value

48in

122 cm · 4 ft

48 in (New York rule)

Set by the state: New York City Building Code 2022 §1809.3.1 (4 ft below the lowest adjacent exposed grade).

Source and how we checked

Richmond County does not publish its own value; the state rule applies.

We searched this place’s own code and website and found no published frost line depth.

Climate: 80 nights a year at or below 32 °F (NOAA 1991–2020, Newark International Airport, 8.5 mi).

Checked Oct 2026. Report a correction

Footings Deck Water line Fence post

0 of 1nearby verified codes use the same depth
80nights a year at or below 32 °F
56%of nearby soil rated “moderate” for frost action (USDA)

How deep is the frost line in Richmond County?

New York City sets the frost footing depth for Richmond County at 48 in (122 cm, 4 ft). Footings, piers and other permanent supports must reach at least this depth (IRC R403.1.4.1).

Who sets the frost line depth in Richmond County?

New York writes this depth into its statewide residential code, so Richmond County’s building department enforces the state’s number rather than setting its own. See how New York sets frost line depth.

How deep do footings, decks and water lines need to be in Richmond County?

House or garage footing Deck footing Water service line Fence post

House or garage footing in Richmond County: dig at least 48 in (122 cm). Below the frost line and at least 12 in deep (IRC R403.1.4).

Minimum depths in Richmond County with a 48 in frost line
Project	Depth	Rule
House or garage footing	48 in	Below the frost line and at least 12 in deep (IRC R403.1.4)
Deck footing (attached)	48 in	Below the frost line and at least 12 in deep (IRC R507.3)
Water service line	54 in	6 in below the frost line and at least 12 in deep (IRC P2603.5)
Fence post bottom	48 in	No code rule; common practice is below the frost line

Work out posts, concrete and footing sizes with the fence post depth calculator or the deck footing calculator.

How cold does it get in Richmond County?

Average lows are at or below freezing from Dec to Feb. 80 nights a year reach 32 °F or colder; Jan is coldest, with an average low of 25.5 °F.

NOAA 1991–2020 climate normals, Newark International Airport station, 8.5 mi away, elevation 7 ft.

Monthly temperatures as a table

°F	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Low	25.5	27.2	34.2	44.1	53.9	63.6	69.4	68	60.7	49	39	31.2
High	40	43	50.9	62.6	72.6	81.8	86.9	84.7	77.7	66	54.9	44.8

Richmond County has fewer freezing nights than 63 of the 67 other New York places we track. The New York median is 141. Coldest: Franklin County; mildest: Kings County.

What frost line depth do towns near Richmond County use?

One official code near Richmond County is verified.

Official frost line depths near Richmond County
Place	Verified frost line	Distance
Mount Vernon	42 in	29 mi away

How likely is the soil in Richmond County to heave?

Low 23%Moderate 56%High 22%

USDA rates the sampled soil around Richmond County as 23% low, 56% moderate, 22% high for frost action (main soils: Greenbelt, Rikers, Boonton).

USDA NRCS soil survey, 9 sample points within 2 mi. Higher frost action means more risk of heave; see frost heave.

How do you confirm the frost line before you dig in Richmond County?

Call 811 (Dig Safely New York) at least a few working days before you dig, so buried lines are marked.
Confirm the frost line depth with the Richmond County building department.
Ask whether your project needs a permit (decks, larger sheds and footings usually do).
Dig below 48 in unless the building department tells you otherwise.
Book the footing inspection before you pour concrete.

Richmond County at a glance

Frost line depth: 48 in (New York rule)
Population (2023 est.): 490,687
Mean annual temperature: 55.5 °F
ZIP codes (13): 10301 · 10302 · 10303 · 10304 · 10305 · 10306 · 10307 · 10308 · 10309 · 10310 · 10311 · 10312 · 10314